diff --git a/variables.tf b/variables.tf
new file mode 100644
index 0000000..e5bae37
--- /dev/null
+++ b/variables.tf
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+variable "containers" {
+  description = "Lista de contenedores a crear"
+  type        = list(string)
+  default     = ["web01", "db01", "proxy01"]
+}